FROM: Solidhal <hal@halemmerich.com>

This patch reverses commit 2b721118b7821107757eb1d37af4b60e877b27e7, as can bee seen here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2b721118b7821107757eb1d37af4b60e877b27e7

This commit caused issues on veyron speedy with ath9k and dwc2 drivers. Any ath9k device (ar9271) 
would intermittently work, most of the time ending in errors as can bee seen here:
https://github.com/SolidHal/PrawnOS/issues/38
This commit fixes that issue.
This is only a temporary work around while a permenant fix is found, as this commit seems to only cause issues
with dwc2

diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
--- b/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ a/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -115,10 +115,10 @@
 	cmd->skb = skb;
 	cmd->hif_dev = hif_dev;
 
+	usb_fill_bulk_urb(urb, hif_dev->udev,
+			 usb_sndbulkpipe(hif_dev->udev, USB_REG_OUT_PIPE),
-	usb_fill_int_urb(urb, hif_dev->udev,
-			 usb_sndintpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 			 skb->data, skb->len,
+			 hif_usb_regout_cb, cmd);
-			 hif_usb_regout_cb, cmd, 1);
 
 	usb_anchor_urb(urb, &hif_dev->regout_submitted);
 	ret = usb_submit_urb(urb, GFP_KERNEL);
@@ -723,11 +723,11 @@
 			return;
 		}
 
+		usb_fill_bulk_urb(urb, hif_dev->udev,
+				 usb_rcvbulkpipe(hif_dev->udev,
-		usb_fill_int_urb(urb, hif_dev->udev,
-				 usb_rcvintpipe(hif_dev->udev,
 						 USB_REG_IN_PIPE),
 				 nskb->data, MAX_REG_IN_BUF_SIZE,
+				 ath9k_hif_usb_reg_in_cb, nskb);
-				 ath9k_hif_usb_reg_in_cb, nskb, 1);
 	}
 
 resubmit:
@@ -909,11 +909,11 @@
 			goto err_skb;
 		}
 
+		usb_fill_bulk_urb(urb, hif_dev->udev,
+				  usb_rcvbulkpipe(hif_dev->udev,
-		usb_fill_int_urb(urb, hif_dev->udev,
-				  usb_rcvintpipe(hif_dev->udev,
 						  USB_REG_IN_PIPE),
 				  skb->data, MAX_REG_IN_BUF_SIZE,
+				  ath9k_hif_usb_reg_in_cb, skb);
-				  ath9k_hif_usb_reg_in_cb, skb, 1);
 
 		/* Anchor URB */
 		usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
@@ -1031,7 +1031,9 @@
 
 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
 {
+	struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
+	struct usb_endpoint_descriptor *endp;
+	int ret, idx;
-	int ret;
 
 	ret = ath9k_hif_usb_download_fw(hif_dev);
 	if (ret) {
@@ -1041,6 +1043,20 @@
 		return ret;
 	}
 
+	/* On downloading the firmware to the target, the USB descriptor of EP4
+	 * is 'patched' to change the type of the endpoint to Bulk. This will
+	 * bring down CPU usage during the scan period.
+	 */
+	for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
+		endp = &alt->endpoint[idx].desc;
+		if ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+				== USB_ENDPOINT_XFER_INT) {
+			endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
+			endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
+			endp->bInterval = 0;
+		}
+	}
+
 	/* Alloc URBs */
 	ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 	if (ret) {
@@ -1252,7 +1268,7 @@
 	if (!buf)
 		return;
 
+	ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
-	ret = usb_interrupt_msg(udev, usb_sndintpipe(udev, USB_REG_OUT_PIPE),
 			   buf, 4, NULL, USB_MSG_TIMEOUT);
 	if (ret)
 		dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");

